Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries.
The relative movement of the plates typically ranges from zero to 100 mm annually.
Lateral density variations in the mantle result in convection.
Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust.Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading.
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